CN112531006A - Organic light emitting display panel and organic light emitting display device - Google Patents
Organic light emitting display panel and organic light emitting display device Download PDFInfo
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
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- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K50/865—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. light-blocking layers
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Abstract
The present application provides an organic light emitting display panel and an organic light emitting display device, wherein the organic light emitting display panel includes: the array substrate, the color film substrate and the transparent filling layer are arranged on the substrate; the array substrate comprises a substrate, an organic light-emitting layer and a thin film packaging layer which are sequentially formed on the substrate, and the color film substrate comprises a cover plate, a color filter layer and an organic protective layer which are sequentially formed on the cover plate; the array substrate and the color film substrate are oppositely arranged, the organic light-emitting layer comprises a plurality of OLED pixel units, the color filter layer comprises a plurality of color resistance units, and the plurality of OLED pixel units and the plurality of color resistance units are arranged in a one-to-one correspondence manner; the transparent filling layer is arranged in a gap between the array substrate and the color film substrate and used for reducing light deflection. In the organic light-emitting display panel and the organic light-emitting display device provided by the application, the transparent filling layer is arranged in the gap between the array substrate and the color film substrate, so that light deflection is reduced, and the problems of fast attenuation of large-viewing-angle brightness and light crosstalk are solved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to an organic light emitting display panel and an organic light emitting display device.
Background
Compared with many Display devices, an Organic Light Emitting Display (OLED for short) has many advantages of being solid-state, self-luminous, wide in viewing angle, wide in color gamut, fast in reaction speed, high in luminous efficiency, high in brightness, high in contrast, ultra-thin, ultra-Light, low in power consumption, wide in working temperature range, capable of manufacturing large-sized and flexible panels, simple in manufacturing process and the like, can achieve flexible Display in a real sense, and can meet the requirements of people on future displays.
In order to improve the contrast ratio of the display device and achieve the integral black effect, the OLED device generally employs a Polarizer (POL), and the POL can effectively reduce the reflection intensity of the external ambient light on the screen. However, the light transmittance of POL is generally only about 44%, and more power consumption is required to achieve higher light output. Moreover, the polarizer has large thickness and brittle material, which is not beneficial to the development of dynamic bending products. In order to develop dynamic bending products based on the OLED display technology, a new technology and a new process must be introduced to replace the polarizer.
For this reason, PFS (POL Free Solution) technology with a Color Filter (CF) is generally used in the industry instead of the polarizer. The CF structure generally includes red (R), green (G), and blue (B) color-resisting units and a Black Matrix (BM), and the red (R), green (G), and blue (B) color-resisting units need to correspond to the red, green, and blue pixel units of the OLED device, respectively. By adopting the PFS technology, the thickness of the functional layer is greatly reduced, the light extraction rate can be improved from 44% to 80%, the light extraction brightness is greatly increased, and therefore the power consumption of the OLED device is reduced.
However, in practical applications, it is found that the problems of fast brightness attenuation at large viewing angle, light crosstalk, etc. generally exist in the OLED products manufactured by the PFS technology, and the display effect is seriously affected.
Disclosure of Invention
In view of the above, the present application provides an organic light emitting display panel and an organic light emitting display apparatus to solve the problems of fast brightness attenuation at a large viewing angle and crosstalk of light in an organic light emitting display device adopting the PFS technology in the prior art.
In order to solve the above technical problem, the present invention provides an organic light emitting display panel, including: the array substrate, the color film substrate and the transparent filling layer are arranged on the substrate;
the array substrate comprises a substrate, an organic light-emitting layer and a thin film packaging layer which are sequentially formed on the substrate, and the color film substrate comprises a cover plate, a color filter layer and an organic protective layer which are sequentially formed on the cover plate;
the array substrate and the color film substrate are oppositely arranged, the substrate of the array substrate faces away from the color film substrate, the cover plate of the color film substrate faces away from the array substrate, the organic light-emitting layer comprises a plurality of OLED pixel units, the color filter layer comprises a plurality of color resistance units, and the plurality of OLED pixel units and the plurality of color resistance units are arranged in a one-to-one correspondence manner;
the transparent filling layer is arranged in a gap between the array substrate and the color film substrate and used for reducing light deflection.
Optionally, in the organic light emitting display panel, the material of the transparent filling layer is optical glue, and an optical refractive index of the optical glue is between 1.2 and 1.8.
Optionally, in the organic light emitting display panel, the viscosity of the optical paste is less than 10000 cps.
Optionally, in the organic light emitting display panel, the thickness of the transparent filling layer is less than 5 μm.
Optionally, in the organic light emitting display panel, a thickness of the organic protective layer is less than 5 μm.
Optionally, in the organic light emitting display panel, the thickness of the thin film encapsulation layer is less than 12 μm.
Optionally, in the organic light emitting display panel, the color filter layer further includes a black matrix, and the black matrix is disposed between adjacent color resistance units;
the openings of the OLED pixel units and the black matrix are of centrosymmetric structures.
Optionally, in the organic light emitting display panel, the central symmetric structure is a square, a diamond, or a circle.
Optionally, in the organic light emitting display panel, an orthogonal projection of the color resistance unit on the substrate is located within an orthogonal projection of the OLED pixel unit on the substrate.
Accordingly, the present invention provides an organic light emitting display device including the organic light emitting display panel as described above.
In the organic light-emitting display panel and the organic light-emitting display device provided by the invention, the transparent filling layer is arranged in the gap between the array substrate and the color film substrate, so that light deflection is reduced, the problems of fast brightness attenuation and light crosstalk at a large viewing angle are solved, the distance between the organic light-emitting layer and the color filter layer is shortened, the influence of shielding of a black matrix is reduced, and the optical performance at the large viewing angle is further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic view illustrating a partial structure of an organic light emitting display panel according to a first embodiment of the present invention;
fig. 2 is a design diagram illustrating a first embodiment of the invention in which the openings of the OLED pixel unit and the black matrix are both circular;
fig. 3 is a design diagram illustrating a first embodiment of the invention in which the openings of the OLED pixel unit and the black matrix are both square;
fig. 4 shows a design diagram of an OLED pixel unit and a black matrix according to a first embodiment of the invention, in which openings are both diamond-shaped structures;
fig. 5 is a schematic view illustrating a partial structure of an organic light emitting display panel according to a second embodiment of the present invention;
fig. 6 is a schematic partial structural view illustrating an organic light emitting display device according to a first embodiment of the present invention when a thickness of a thin film encapsulation layer is consistent with that of the related art.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
[ EXAMPLES one ]
Fig. 1 is a schematic view of a partial structure of an organic light emitting display panel according to a first embodiment of the invention. As shown in fig. 1, the organic light emitting display panel 100 includes: an array substrate, a color film substrate and a transparent filling layer 20; the array substrate comprises a substrate 11, an organic light-emitting layer 12 and a thin film packaging layer 13 which are sequentially formed on the substrate 11, and the color film substrate comprises a cover plate 14, a color filter layer 15 and an organic protective layer 16 which are sequentially formed on the cover plate 14; the array substrate and the color film substrate are oppositely arranged, the substrate 11 of the array substrate faces away from the color film substrate, the cover plate 14 of the color film substrate faces away from the array substrate, the organic light emitting layer 12 comprises a plurality of OLED pixel units 120, the color filter layer 15 comprises a plurality of color resistance units 150, and the plurality of OLED pixel units 120 and the plurality of color resistance units 150 are arranged in a one-to-one correspondence manner; the transparent filling layer 20 is disposed in a gap between the array substrate and the color film substrate, and is used for reducing light deflection.
Specifically, the array substrate includes a substrate 11, a Thin Film Transistor (TFT) array layer (not shown in the figure), an organic light emitting layer 12 and a Thin Film Encapsulation layer (TFE) 13, which are sequentially stacked, where the organic light emitting layer 12 includes a plurality of OLED pixel units 120, the plurality of OLED pixel units 120 includes a red pixel unit R, a green pixel unit G and a blue pixel unit B, and the red pixel unit R, the green pixel unit G and the blue pixel unit B are all arranged in an array manner.
The color film substrate comprises a plurality of color resistance units 150 and black matrixes (reference numerals in the figure are not shown), the color resistance units 150 comprise red color resistance units R, green color resistance units G and blue color resistance units B, the red color resistance units R, the green color resistance units G and the blue color resistance units B are arranged in an array mode, the black matrixes are also called light shielding layers or BM layers, the black matrixes are arranged between the adjacent color resistance units 150, and the organic protective layer (namely, the OC layer) 16 covers the black matrixes and the color resistance units 150. Here, the light transmittance of the black matrix is almost 0, and the light emitted from the OLED pixel unit 120 can only transmit through the plurality of color resistance units 150.
The array substrate and the color film substrate are oppositely arranged, the substrate 11 of the array substrate faces away from the color film substrate, and the cover plate 14 of the color film substrate faces away from the array substrate, that is, the film layer (including the organic light emitting layer 12 and the thin film encapsulation layer 13) on the substrate 11 and the film layer (the color filter layer 15 and the organic protective layer 16) on the cover plate 14 are both located between the substrate 11 and the cover plate 14. The color filter substrate comprises a plurality of color resistance units 150 and a plurality of OLED pixel units 120, wherein the plurality of color resistance units 150 correspond to the plurality of OLED pixel units 120 of the array substrate one to one. Preferably, the orthographic projection of the color resistance unit 150 on the substrate 11 is located in the orthographic projection of the OLED pixel unit 120 on the substrate 11.
The transparent filling layer 20 is filled in the gap between the array substrate and the color filter substrate instead of air, and since the optical refractive index (for example, N ═ 1.5) of the transparent filling layer 20 is greater than the optical refractive index (N ═ 1) of air, the transparent filling layer 20 can reduce light deflection.
As shown in fig. 1, when the OLED pixel unit 120 is turned on, the emitted light sequentially passes through the thin film encapsulation layer 13 and the transparent filling layer 20 and then reaches the color filter layer 15, when the light emitting angle is 0 °, the light is perpendicularly incident to the color filter layer 15, the perpendicularly incident position is a central position, when the light emitting angle is θ, the light emitting direction after reaching the color filter layer 15 is shown by an arrow a in the figure, the distance between the position where the light is incident to the color filter layer 15 and the central position is an optical path offset distance, in the prior art, the light sequentially passes through the thin film encapsulation layer 13 and air and then reaches the color filter layer 15 at the same light emitting angle θ, and the light emitting direction after reaching the color filter layer 15 is shown by an arrow b in the figure, it can be seen that the transparent filling layer 20 is arranged between the array substrate and the color filter substrate to reduce light deflection, the optical path offset distance will be smaller.
Further, if the transparent filling layer 20 is not disposed between the array substrate and the color filter substrate, light with an exit angle θ may directly enter the color resistance unit adjacent to the OLED pixel unit 120, for example, light emitted from the red pixel unit R may enter the green color resistance unit G or the blue color resistance unit B, so as to cause light crosstalk. When the transparent filling layer 20 is disposed between the array substrate and the color film substrate, light with an exit angle θ may reduce an optical path offset distance, and may be incident on the black matrix or the color resistance unit corresponding to the OLED pixel unit 120, for example, light emitted by the red pixel unit R may be incident on the black matrix or the red color resistance unit R, so as to avoid a light crosstalk problem.
In addition, because part of the light rays are not incident to the black matrix any more after being refracted but incident to the corresponding color resistance units, the influence of the light rays shielded by the black matrix is reduced, and the large-view-angle brightness attenuation amplitude is reduced.
In this embodiment, the material of the transparent filling layer 20 is optical glue, and the optical refractive index of the optical glue is between 1.2 and 1.8.
Preferably, the viscosity of the optical cement is less than 10000 cP.sec (cps). The optical cement has low viscosity, and a uniform and thin optical cement layer (i.e., the transparent filling layer 20) can be obtained.
In this embodiment, the OLED pixel unit 120 adopts a centrosymmetric design, which can ensure that the large viewing angle effects in the 0 ° and 90 ° directions are consistent. Preferably, the plurality of OLED pixel units 120 and the openings of the black matrix are both in a central symmetrical structure, and the central symmetrical structure includes a circular, square, diamond or other regular polygonal structure.
As shown in fig. 2, the openings of the OLED pixel unit 120 and the black matrix are both circular, and the distance d between the black matrix and the OLED pixel unit 120 is set. As shown in fig. 3, the openings of the OLED pixel unit 120 and the black matrix are square, and the distance d between the black matrix and the OLED pixel unit 120 is provided. As shown in fig. 4, the openings of the OLED pixel unit 120 and the black matrix are both rhombus, the distance between the black matrix and the OLED pixel unit 120 is d, the opening area of the black matrix is the same as the square structure design, because the rhombus rotates 45 degrees with respect to the square, when the viewing angle is observed at 0 ° or 90 °, the distance between the black matrix and the OLED pixel unit 120 becomes d/cos45 degrees, the alignment difficulty is reduced, and meanwhile, because the shielding area of the OLED pixel unit 120 is reduced, the large viewing angle brightness attenuation amplitude is further reduced, and the visual experience is better.
In the present embodiment, the overall thickness of the transparent filling layer 20, the organic protection layer 16 and the thin film encapsulation layer 13 is thinner than that of the prior art. Thus, the distance between the organic light emitting layer 12 and the color filter layer 15 can be reduced, and the problems of light crosstalk and attenuation under a large viewing angle can be further improved.
Preferably, the thickness of the transparent filling layer 20 is less than 5 μm, the thickness of the organic protection layer 16 is less than 5 μm, and the thickness of the thin film encapsulation layer 13 is less than 12 μm, for example, the thickness of the transparent filling layer 20 is 2 μm, the thickness of the organic protection layer 16 is 3 μm, and the thickness of the thin film encapsulation layer 13 is 6 μm.
Accordingly, the present invention also provides an organic light emitting display device including the organic light emitting display panel 100 as described above. Please refer to the above, which is not described herein.
[ example two ]
Fig. 5 is a schematic partial structure view of an organic light emitting display panel according to a second embodiment of the present invention. As shown in fig. 5, the organic light emitting display panel 200 includes: an array substrate, a color film substrate and a transparent filling layer 20; the array substrate comprises a substrate 11 and an organic light-emitting layer 12 sequentially formed on the substrate 11, and the color film substrate comprises a cover plate 14, and a color filter layer 15 and an organic protective layer 16 sequentially formed on the cover plate 14; the array substrate and the color film substrate are oppositely arranged, the substrate 11 of the array substrate faces away from the color film substrate, the cover plate 14 of the color film substrate faces away from the array substrate, the organic light emitting layer 12 comprises a plurality of OLED pixel units 120, the color filter layer 15 comprises a plurality of color resistance units 150, and the plurality of OLED pixel units 120 are arranged in one-to-one correspondence with the plurality of color resistance units 150; the transparent filling layer 20 is disposed in a gap between the array substrate and the color film substrate, and is used for reducing light deflection.
Specifically, the array substrate includes a substrate 11, a Thin Film Transistor (TFT) array layer (not shown in the figure), and an organic light emitting layer 12, which are sequentially stacked. The color filter substrate includes a plurality of color resistance units 150 and a black matrix (reference numbers in the figure are not shown). The array substrate and the color film substrate are arranged oppositely, and the plurality of color resistor units 150 of the color film substrate correspond to the plurality of OLED pixel units 120 of the array substrate one to one.
The difference between this embodiment and the first embodiment is that the array substrate is not provided with a thin film encapsulation layer, i.e. the thickness of the thin film encapsulation layer is zero, so the distance between the organic light emitting layer 12 and the color filter layer 15 is closer. In the prior art, the thickness of the thin film encapsulation layer is about 12 μm. In the organic light emitting display panel 200 provided in the present embodiment, the distance between the organic light emitting layer 12 and the color filter layer 15 is reduced by about 12 μm, compared to the related art. Therefore, the problems of light crosstalk and attenuation under a large viewing angle are further improved.
Referring to fig. 5 and 6, in the organic light emitting display panel (i.e., the organic light emitting display panel 100) with a film encapsulation layer thickness of 12 μm, the light with the exit angle β may generate a cross-color phenomenon, and the light with the exit angle between α and β may be blocked by the black matrix, whereas in the organic light emitting display panel (i.e., the organic light emitting display panel 200) with a film encapsulation layer thickness of zero, because the distance between the organic light emitting layer 12 and the color filter layer 15 is reduced, a portion of the light with the exit angle β may not generate the cross-color phenomenon, and the light with the exit angle between α and β may not be completely blocked by the black matrix.
In this embodiment, the organic light emitting display panel 200 further includes: and the sealing frame (not shown in the figure) is connected between the edge of the array substrate and the edge of the color film substrate and is used for enhancing the water and oxygen barrier capability of the device. Therefore, even if the array substrate is not provided with the thin film encapsulation layer, the sealing frame can ensure that the electrode and the organic layer of the OLED device are not corroded by water and oxygen to reduce the service life of the OLED device.
In this embodiment, the transparent filling layer 20 is disposed in the gap between the array substrate and the color filter substrate, and the distance between the organic light emitting layer 12 and the color filter layer 15 is reduced, so that the large-viewing-angle optical performance of the PFS product is greatly improved.
Accordingly, the present invention also provides an organic light emitting display device including the organic light emitting display panel 200 as described above. Please refer to the above, which is not described herein.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The above drawings are merely schematic illustrations of the organic light emitting display panel provided by the present invention. For clarity, the shapes of the elements and the number of the elements in the above-mentioned figures are simplified and some elements are omitted, so that those skilled in the art can make changes according to actual needs, and the changes are within the protection scope of the present invention and will not be described herein.
In summary, in the organic light emitting display panel and the organic light emitting display device provided by the invention, the transparent filling layer is arranged in the gap between the array substrate and the color film substrate, so that light deflection is reduced, the problems of fast brightness attenuation at a large viewing angle and light crosstalk are solved, further, the distance between the organic light emitting layer and the color filter layer is shortened, the influence of black matrix shielding is reduced, and the optical performance at the large viewing angle is further improved.
The foregoing is a more detailed description of the present application in connection with specific preferred embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. An organic light emitting display panel, comprising: the array substrate, the color film substrate and the transparent filling layer are arranged on the substrate;
the array substrate comprises a substrate, an organic light-emitting layer and a thin film packaging layer which are sequentially formed on the substrate, and the color film substrate comprises a cover plate, a color filter layer and an organic protective layer which are sequentially formed on the cover plate;
the array substrate and the color film substrate are oppositely arranged, the substrate of the array substrate faces away from the color film substrate, the cover plate of the color film substrate faces away from the array substrate, the organic light-emitting layer comprises a plurality of OLED pixel units, the color filter layer comprises a plurality of color resistance units, and the plurality of OLED pixel units and the plurality of color resistance units are arranged in a one-to-one correspondence manner;
the transparent filling layer is arranged in a gap between the array substrate and the color film substrate and used for reducing light deflection.
2. The organic light emitting display panel of claim 1, wherein the material of the transparent filling layer is an optical glue, and the optical refractive index of the optical glue is between 1.2 and 1.8.
3. The organic light emitting display panel of claim 2, wherein the optical paste has a viscosity of less than 10000 cps.
4. The organic light emitting display panel of claim 1, wherein the transparent fill layer has a thickness of less than 5 μ ι η.
5. The organic light emitting display panel of claim 1, wherein the organic protective layer has a thickness of less than 5 μ ι η.
6. The organic light emitting display panel of claim 1, wherein the thin film encapsulation layer has a thickness of less than 12 μ ι η.
7. The organic light-emitting display panel according to claim 1, wherein the color filter layer further comprises a black matrix provided between adjacent color resist units;
the openings of the OLED pixel units and the black matrix are of centrosymmetric structures.
8. The organic light emitting display panel of claim 7, wherein the central symmetric structure is a square, a diamond, or a circle.
9. The organic light emitting display panel of claim 1, wherein an orthographic projection of the color-resistive unit on the substrate is within an orthographic projection of the OLED pixel unit on the substrate.
10. An organic light emitting display device, comprising: the organic light emitting display panel according to any one of claims 1 to 9.
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| CN202011505929.1A CN112531006A (en) | 2020-12-18 | 2020-12-18 | Organic light emitting display panel and organic light emitting display device |
| US17/551,363 US20220199942A1 (en) | 2020-12-18 | 2021-12-15 | Organic light emitting display panel and organic light emitting display apparatus |
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| CN202011505929.1A CN112531006A (en) | 2020-12-18 | 2020-12-18 | Organic light emitting display panel and organic light emitting display device |
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| CN114138132A (en) * | 2021-11-25 | 2022-03-04 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN114138132B (en) * | 2021-11-25 | 2023-06-27 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
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